s1_goto_dir(){
cd "$1" || exit 1
}

s2_touch_empty_file_with_given_name(){
touch "$1"
}

s3_make_directories(){
mkdir -p projects/git projects/backup
}

s4_create_6_files(){
touch ./projects/linux{1,2}_{centos,redhat,c_programming}
}

s5_make_directories_in_git(){
mkdir -p projects/git/linux{1,2}
}

s6_move_files_to_dir_1_or_2(){
mv projects/linux1* projects/git/linux1
mv projects/linux2* projects/git/linux2
}

s7_create_package_and_compress(){
tar -czvf projects/backup/git.tar.gz projects/git
}

s8_delete_dir_git(){
rm -rf projects/git
}

s9_recover_from_git_tar_gz_backup(){
tar -zxvf projects/backup/git.tar.gz projects/
}

s10_create_package_and_compress(){
tar -jcvf projects/backup/git.tar.bz2 projects/git
}

s11_find_and_sort_alphabetically_all_created_files_and_dirs(){
find ./projects | sort
}

s12_get_next_15_minutes_boundary(){
date -d @$(($(date +%s)/900*900+900)) "+%Y-%m-%d_%H:%M:%S"
}
